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Organization and Summary of Significant Accounting Policies - Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share for Out of Money Potential Common Shares (Parenthetical) (Detail) - $ / shares | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Stock Options with an Exercise Price of $3.59 per Share [Member] |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |
Stock options exercise price per share | $ 3.59 | $ 3.59 | $ 3.59
Stock Options With an Exercise Price of $12.48 per Share [Member] |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |
Stock options exercise price per share | 12.48 | 12.48 | 12.48
Stock Options With an Exercise Price of $12.84 per Share [Member] |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |
Stock options exercise price per share | 12.84 | 12.84 | 12.84
Stock Options With an Exercise Price of $26.40 per Share [Member] |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |
Stock options exercise price per share | 26.40 | 26.40 | 26.40
Stock Options With an Exercise Price of $32.76 per Share [Member] |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |
Stock options exercise price per share | 32.76 | 32.76 | 32.76
Stock Options With an Exercise Price of $34.68 per Share [Member] |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |
Stock options exercise price per share | 34.68 | 34.68 | 34.68
Stock Options With an Exercise Price of $39.00 per Share [Member] |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |
Stock options exercise price per share | 39.00 | 39.00 | 39.00
Stock Options With an Exercise Price of $41.16 per Share [Member] |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |
Stock options exercise price per share | 41.16 | 41.16 | 41.16
Stock Options With an Exercise Price of $42.00 per Share [Member] |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |
Stock options exercise price per share | 42.00 | 42.00 | 42.00
Stock Options With an Exercise Price of $46.80 per Share [Member] |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |
Stock options exercise price per share | 46.80 | 46.80 | 46.80
Stock Options With an Exercise Price of $3.52 per Share [Member] |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |
Stock options exercise price per share | 3.52 | 3.52 | 3.52
Stock Options With an Exercise Price of $43.20 per Share [Member] |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |
Stock options exercise price per share | $ 43.20 | $ 43.20 | $ 43.20

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- Definition Exercise price of the option. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 13 -Footnote 5 + Details
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